Do Asphalt Roofing Shingles Fade or Change Colors Over ...

Have you noticed that your shingles appear different from when they were installed? Do they seem darker or lighter than before? It's not uncommon for asphalt shingles to change colors with the passing years. While this is a natural process, it can indicate the aging of your roof. Both faded and darkened shingles signify that the materials are deteriorating, although it doesn't always mean your roof is severely damaged.

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Why do asphalt shingles change color over time? What implications does this have? Let’s dive deeper into the factors that cause your shingles to lighten or darken as they age.

Why Roofing Shingles Fade in Color

Asphalt shingles, as their name suggests, are composed of asphalt. Though they are designed to endure various weather conditions, they remain susceptible to color fading. This process is primarily caused by prolonged exposure to ultraviolet (UV) light from the sun. In drier climates, this fading occurs more rapidly.

Some shingles fade more quickly than others. Generally, darker shingles will make any change in color more noticeable over time. When selecting shingle colors for your home, consider how much sunlight your roof will receive. This will depend on your geographical location as well as the amount of shade cast by surrounding trees. If you have mature trees nearby, they may offer some relief from direct sunlight during certain times of the day.

While color fading signifies age, it doesn’t always correlate with functional failures in the roof. However, keep in mind that older asphalt shingles are more prone to cracking, warping, and damage from storms.

Why Roofing Shingles Become Darker

Although most asphalt shingles tend to lighten as they grow older, it is also common for some to darken over time. Darkened shingles often indicate the presence of algae growth. Algae spores thrive particularly well in humid climates. These spores spread through the air and can settle on your roof, taking root in the tiny pores of the asphalt shingles.

While darkened shingles may detract from your roof's appearance, they are typically not harmful. The algae contribute to uneven color distribution, which is aesthetically unpleasing. Although it is possible to clean algae from your roof, it is advisable to avoid doing so without professional assistance. Harsh cleaning products may damage your shingles and potentially void any manufacturer warranties. Always consult your manufacturer for the best cleaning products and methods.

Dealing with Discolored Shingles

Unsightly discoloration on your roof can be frustrating. While it doesn't necessarily threaten your roof's protective capabilities, it could reduce your home's value, especially if you're considering selling. If you've noticed significant aging in your roof, consider scheduling an inspection with our roofing experts. We offer free estimates for any necessary roofing replacements.

What Causes Roof Shingle Discoloration and How to Fix It

Maintaining the integrity of your roof is essential for your home's overall health, and addressing discoloration is a key part of that maintenance. This section will explore various causes of roof shingle discoloration and suggest easy ways to restore your roof's aesthetic appeal.

Causes of Roof Shingle Discoloration

#1. Algae Growth

Algae are one of the most prevalent causes of discoloration in roof shingles. If left unattended, they can cause significant structural damage. The powdered limestone fillers in asphalt shingles provide nutrients for algae, allowing them to spread and discolor the roof. Some algae types are naturally pigmented, which further alters the roof's appearance. Algae can also obstruct proper water drainage, leading to leaks and deterioration of roofing materials.

#2. Rust Stains

Rust can be detrimental to your roof's structure and appears as red or brown marks. This discoloration often originates from damaged or aging roof flashing, chimneys, and other metal components. Addressing rusty roof elements is vital, as they can lead to water seepage. Regular inspections are crucial, particularly around chimneys, to identify and rectify rust or damage quickly.

Fasteners can also be a source of rust stains. Careful treatment, such as sanding away rust and sealing the area, can help. Additionally, various rust removal techniques exist, including specialized cleaners.

#3. Lichen and Moss Growth

Lichen and moss can accumulate on roofs, causing discoloration and moisture retention. These organisms thrive in moist, cool conditions, and when they attach to shingles, they can erode the protective granules. Bird droppings are a common contributor to this growth as they provide nutrients. Mitigation strategies include the installation of copper or zinc strips, regular tree trimming, and utilizing algae-resistant shingles.

#4. Asphalt Bleed Through

Asphalt bleed through occurs when the oils in asphalt shingles surface, creating black streaks. Factors such as high temperatures, low-quality asphalt, and poor ventilation can lead to this issue. Consult a roofing expert to determine if a replacement is necessary before attempting to clean asphalt bleed-through, as it can mimic algae stains.

How to Fix Discolored Roof Shingles

The method of cleaning your shingles largely depends on the cause of discoloration. Here are some approaches, but consult a roofing contractor if you’re uncertain about the best course of action.

1. Use Bleach Solution for Algae Discoloration

A diluted solution of bleach and water (50/50) can be effective against algae growth. Avoid pressure washing, which could harm the shingles. Placing zinc or copper strips under the upper row of shingles can help prevent future algae growth. Regularly trimming trees can also minimize shade, reducing the likelihood of algae developing.

2. Remove Rust Stains

Oxalic acid is a suitable option for treating rust stains. However, safety measures must be taken to protect yourself and your roof. Always wear gloves, goggles, and a respirator when handling chemicals. Ensure you are in a well-ventilated area, and dispose of any waste according to local regulations.

What Are Algae-Resistant Shingles?

These shingles are specially designed to inhibit algae growth, incorporating copper granules that prevent mold, mildew, and algae. Benefits include reduced stains, lower energy costs, extended roof lifespan, and diminished cleaning maintenance. Algae-resistant shingles are particularly beneficial in warm, humid environments. Routine professional inspections are recommended for optimal performance.

Conclusion

Roof shingle discoloration is a common issue stemming from various causes. Understanding these factors and applying appropriate solutions can help maintain the vibrant and resilient nature of your roof. Regular inspections, timely repairs, and proper cleaning methods contribute to a longer roof life and an attractive home.

If you're interested in knowing more about faded roof shingles, don't hesitate to reach out for assistance.

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